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# The population of a country decreased from 162 million to 157 million over the course of 20 years. What was the percentage decrease?

### 5 Answers

- Anonymous1 month ago
You've got to be kidding? What grade are you in? 4?

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- PuzzlingLv 71 month ago
Here's the formula for any percentage change problem:

(new - old) / old × 100%

Basically you figure out the amount of the change, divide it by the original amount then multiply it by 100% to make it a percentage.

Note: This works for an increase or a decrease. If it is an increase, the resulting number is positive. If it is a decrease, the resulting number is negative.

In your case:

old = 162 (million)

new = 157 (million)

Plug in your values:

(162 - 157) / 162 × 100%

= -5 / 162 × 100%

≈ -0.030864 × 100%

≈ -3.0864%

We can round that to something reasonable, like 1 decimal place:

≈ -3.1%

So the percentage change is -3.1%.

That means the population *decreased* by 3.1%

Answer:

Approximately a 3.1% decrease in population.

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- KrishnamurthyLv 71 month ago
The population of a country decreased from 162 million to 157 million

over the course of 20 years.

The percentage decrease was 3.086419753.

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- DavidLv 71 month ago
Population decrease: (162-157)/162 times 100 = about 3.1%

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